Something about the ability of the wave forms they generate to
damage equipment if I remember right.

Thats what I read too. Especially with pumps/motors.

I've seen a DIY site that uses basically what you mentioned above, except they
used a marine battery for boats so the unit could be inside and charged by the
AC of the house.

http://www.google.com/search?hl=en&i...marine+battery
~John